Mechanical movement



A. L. DE LEEUW.

MECHANICAL MOVEMENT. APPLICATION FILED SEPT. 25. 1920.

2 SHEETSSHEET I.

L4 vi A. L. DE LEEUW.

MECHANICAL MOVEMENT.

APPLICATION FILED SEPT. 25. I920.

1,430,496. Patented Sept. 26, 1922.

2 SHEETSSHEET 2- H610 may 5 5%? Patented Sept. 26, 1922.

UNITED STATES.

ADOLPH L. DE nnuw, or PLAINEIELD, new JERSEY.

MECHANICAL MOVEMENT.

Application filed September 25, 1920.. Serial No. 412,786.

To all whom it may concern:

Be it known that I, Ano rH L. Dr: LnnUW, a citizen of the United States, residingin Plainfield, New Jersey, have invented certain Improvements in a Mechanical Movement, of which the following is ,a specification.

The object of this invention is to provide a mechanism for converting a rotary motion into a reciprocating motion and to provide means for so controlling the movement of the reciprocating element that when the parts are adjusted to vary the length of stroke of said element, such variation will affect or be applied to but one end only of said stroke.

This invention is especially adapted for use in slotting machines, and other reciprocating motion machines, in which the length of stroke of the slotting, or other, head must be increased or diminished and where it was hitherto necessary to alter the position of the work support toaccommodate this change. By my invention the position of one end of the path of movement of the head, usually the point to which it moves at the lower end of its stroke, remains unchanged, and any adjustment takes place at, or is applied to, the opposite end of the stroke.

In the accompanying drawings:

Fig. 1 is a side view, in diagram. illustrating my invention and showing the fulcrum at one point and the yoke at the eX- treme upper point of its movement with the slide at the lowest point of its stroke.

Fig. 2 is a view, similar to Fig. 1, showing the slide at the extreme upper end of its stroke, the fulcrum being in the same position as in Fig. 1;

Fig. 3 is a view with the parts in the position illustrated in Fig. 1, with the exception that the fulcrum has been moved towards the slide;

Fig. 4 is a view, similar to Fig. 2, with the exception that the fulcrum is in the position illustrated in Fig. 3, and

Fig. 5 is a view illustrating a modification of the invention.

1 indicates a driven shaft on which is a crank disk 2 carrying a pin 3 on which is a block 4: adapted to slide in a slot 5 in a yoke 6. The end of this yoke is pivoted at 7 to a slide 8 adapted to slide in a guideway 9. 10 is the fulcrum pin on which is a block 11 adjustably slidable in a curved slot 12 13 represents a shaft on which is an arm 14 carrying the fulcrum pin 10 and the curve of the slot 12 is concentric-with this shaft 13 when the crank pin 3 is in its highest position, Figs. 1 and 3. In the present instance,-the latter is adjusted by worm 15 on a shaft 16 which canv be turned by hand in any suitable manner and theworm meshes with the teeth of a segment 17 secured to the shaft 13 so that on turning the worm shaft the fulcrum pin 10 and its block 11 can beadjusted in the slot l2ofthe yoke. In the present instance the slide 8 carries an indicator or pointer 18, positioned to cooperate with. a scale on the guideway 9.

When this invention is applied to aslotting machine, for instance, then 1 represents the power shaft of the machine; 6 the yoke and 8 the reciprocating ram, which carries the tool and moves towards and from a table on which the work'is mounted. One of the features of this invention, when applied to a slotting machine, is that the stroke of the ram can be lengthened and shortened without changing the position of the lower end of its stroke. 9 represents the frame of the machine in which the ram reciprocates.

It will be seen, on referring to Figs. 1 and 3, that when the ram is in its lowest position, as in said figures, the fulcrum pin 10 can be moved to any position in the curved slot 12 without changing the position of said ram, and when the shaft 1 is turned, then the crank pin 3 will act upon the yoke and will raise the ram, as in Fig. 2, to its extremeupper position when the fulcrum pin 10 occupies a position in the slot 12 farthest from the pivot pin 7 on the ram. As this fulcrum pin is moved towards the pin 7 then thelength of the movement of the slide or ram is decreased until when said pin 10 is in the position shown in Fig. 4c, the stroke of the slide or ram is reduced to its lower limit. In'any case however the lower end of the stroke as shown by the pointer 18 remains unaltered and thevariations made in said stroke are added to or subtracted from its upper end. The inven tion is thus particularly adapted for use in slotting and like machines where a piece of work can be placed on a table and the length of movement or stroke of the tool can be varied without any alteration of its relation to the table at the lower end of its stroke.

In Fig. 5, I have illustrated a modification of the invention in which 6 is the yoke actuated by a shaft 1 through a pin 3 on the disk 2 This yoke is pivoted at 7 to the slide 8 The slot 12 in the yoke is straight and the fulcrum pin 10 can be adjusted in this slot to vary the length of the movement of the slide 8". In this case, however, when the length of movement of the slide is altered there is no fixed point at either end of the stroke as in the construction illustrated in Fig. 1.

I claim:-

1. The combination of a yoke having a curved slot; a power shaft; a crank pin on the power shaft engaging the yoke; a slide pivoted to the yoke; a guide for the slide; a fulcrum pin; a block on said pin adjustable in the slot of the yoke; a swinging arm of a length substantially equal to that of the radius of curvature of the slot and operative on the block; with means for swinging said arm to adjust the position of the block, and with it the fulcrum pin, to wards or from the power shaft to vary the stroke of the slide 2. The combination of a yoke; a slide pivoted to the yoke; power mechanism for operating the yoke to reciprocate the slide, said yoke having a curved portion between the slide and the power mechanism; with a fulcrum member operative on the curved portion of the yoke; and means including an element having an effective length substantially equal to the radius of curvature naeonae of said curved portion of the yoke for adjusting the fulcrum member to vary the stroke of the slide.

3. The combination of a yoke; slide to which the yoke is pivoted; a power shaft having a crank operative on the yoke to reciprocate the slide; a pivoted fulcrum arm the yoke being curved concentrically with the pivot of the arm to permit said arm to be adjusted towards and from the pivot of the yoke to vary the stroke of the slide without altering the position of one eX- tremity of said stroke when the yoke is in one position.

4. The combination in a mechanical movement of a slotted yoke; a slide to which the yoke is pivoted; a power shaft; a disk on the shaft having a crank pin; a block on the crank pin slidable in the yoke, that por tion of the yoke nearest the pivot pin being curved; a second shaft; an arm on said shaft; a fulcrum pin on the arm; a block carried by the fulcrum pin and slidable in the curved portion of the yoke, concentrically with said second shaft when the yoke is in one position; a toothed segment on the said shaft; a worm engaging the segment; and a supporting shaft for the worm.

5. The combination in a mechanical movement of a crank; a reciprocatory slide; a yoke operatively connecting the slide and the crank; and means operative on the yoke when in one position for adjusting the stroke of the slide while maintaining immovable the position of one end of its path of movement.

ADOLPH L. DE LEEUW. 

